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Junjie Gao
Intern Full-Stack/Frontend Engineer specializing in data pipelines and analytics dashboards
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Backend engineer with experience at Roche and Jarsy focused on API and data-layer performance. Re-architected slow generalized endpoints into more efficient APIs (30% faster lookups) and led a schema refactor/migration with feature-flag rollout, dual writes, rollback scripts, and automated integrity checks; also addressed pipeline duplicate-entry issues via deduplication.
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Key Strengths
- Improved backend lookup performance by ~30% via targeted endpoint redesign and more efficient querying
- Strong judgment on architectural tradeoffs (avoided unnecessary GraphQL layer; simplified API surface)
- Server-side preprocessing and schema restructuring to reduce client-side work and speed frontend rendering
- Led incremental backend schema refactor using feature flags to manage rollout risk
- Data integrity during migrations: schema versioning, rollbackable migration scripts, dual writes, automated validation/reprocessing
- Identified and fixed duplicate-entry failure mode in pipeline migration (hashset-based deduplication)
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